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The 40 pogo pin on comet device includes USB pins as well, allowing for seamless integration with Human Interface Devices (HID), such as gamepads. This feature simplifies connectivity and enhances user experience when attaching peripheral devices.
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The Comet Extension Gamepad is powered by the versatile **RP2040 microcontroller**, which provides a robust USB interface supporting both host and device modes. This makes it especially convenient for use with HID peripherals.
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## Firmware Options
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- The gamepad operates with an Arduino-based firmware. You can access the firmware file [here](https://web-assets.mecha.so/developers-v1/comet/extensions/gamepad-arduino-firmware.rar).
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- Alternatively, you can flash your own custom firmware, whether it's written in **Arduino** or **Python**, to meet your specific requirements.
-[Download CAD Files](https://web-assets.mecha.so/developers-v1/comet/extensions/OBJ_PCB_mecha-gamepad-extension_2025-02-25.zip), To open CAD files we can use any 3D design software like autodesk viewer on FreeCAD.
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-[Download PCB Design files](https://web-assets.mecha.so/developers-v1/comet/extensions/mecha-gamepad-extension-pcb.rar), To open PCB files we can use PCB design software like EasyEDA-standard.
The IO Breakout device is equipped with **40 pogo pins**, allowing seamless connection to various extensions such as GPIOs, gamepads, and keyboards. To make these GPIO pins breadboard-friendly, the **GPIO Extension** is utilized.
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## GPIO Extension Features
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1.**Breadboard-Friendly Interface**
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The GPIO Extension converts the 40 pogo pins into **2.54mm pitch female headers**, making it easier to connect using jumper wires for prototyping and experimentation.
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2.**USB-to-UART Conversion**
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The GPIO Extension includes a **CP2102 USB-to-UART converter chip**, which facilitates the conversion of USB signals into UART signals, streamlining communication with your host system. to connect with your host system there is type C port on GPIO Extension.
-[Download CAD Files](https://web-assets.mecha.so/developers-v1/comet/extensions/OBJ_PCB_mecha-io-extension_2025-02-20.zip), To open CAD files we can use any 3D design software like autodesk viewer on FreeCAD.
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-[Download PCB Design files](https://web-assets.mecha.so/developers-v1/comet/extensions/mecha-io-extension-pcb.rar), To open PCB files we can use PCB design software like EasyEDA-standard.
Discover the Mecha Comet, learn how-to-use, understand its peripherals and find out how you can build and run applications. The sections available within this documentation are shown below.
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